| #!/usr/bin/env python |
| |
| ''' |
| Licensed to the Apache Software Foundation (ASF) under one |
| or more contributor license agreements. See the NOTICE file |
| distributed with this work for additional information |
| regarding copyright ownership. The ASF licenses this file |
| to you under the Apache License, Version 2.0 (the |
| "License"); you may not use this file except in compliance |
| with the License. You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| ''' |
| |
| from ambari_commons.exceptions import FatalException |
| from ambari_commons.os_check import OSConst, OSCheck |
| import os |
| import logging |
| import signal |
| import threading |
| import traceback |
| from ambari_commons.os_family_impl import OsFamilyImpl |
| import sys |
| |
| from ambari_agent.RemoteDebugUtils import bind_debug_signal_handlers |
| |
| logger = logging.getLogger() |
| |
| _handler = None |
| |
| class HeartbeatStopHandlers(object):pass |
| |
| # windows impl |
| |
| @OsFamilyImpl(os_family=OSConst.WINSRV_FAMILY) |
| class HeartbeatStopHandlersWindows(HeartbeatStopHandlers): |
| def __init__(self, stopEvent=None): |
| import win32event |
| # Event is used for synchronizing heartbeat iterations (to make possible |
| # manual wait() interruption between heartbeats ) |
| self._heventHeartbeat = win32event.CreateEvent(None, 0, 0, None) |
| |
| # Event is used to stop the Agent process |
| if stopEvent is None: |
| # Allow standalone testing |
| self._heventStop = win32event.CreateEvent(None, 0, 0, None) |
| else: |
| # Allow one unique event per process |
| self._heventStop = stopEvent |
| |
| def set_heartbeat(self): |
| import win32event |
| |
| win32event.SetEvent(self._heventHeartbeat) |
| |
| def reset_heartbeat(self): |
| import win32event |
| |
| win32event.ResetEvent(self._heventHeartbeat) |
| |
| def wait(self, timeout1, timeout2=0): |
| import win32event |
| |
| timeout = int(timeout1 + timeout2) * 1000 |
| |
| result = win32event.WaitForMultipleObjects([self._heventStop, self._heventHeartbeat], False, timeout) |
| if ( |
| win32event.WAIT_OBJECT_0 != result and win32event.WAIT_OBJECT_0 + 1 != result and win32event.WAIT_TIMEOUT != result): |
| raise FatalException(-1, "Error waiting for stop/heartbeat events: " + str(result)) |
| if (win32event.WAIT_TIMEOUT == result): |
| return -1 |
| return result # 0 -> stop, 1 -> heartbeat |
| |
| # linux impl |
| |
| def signal_handler(signum, frame): |
| global _handler |
| logger.info("Ambari-agent received {0} signal, stopping...".format(signum)) |
| _handler.set_stop() |
| |
| |
| def debug(sig, frame): |
| """Interrupt running process, and provide a stacktrace of threads """ |
| d = {'_frame': frame} # Allow access to frame object. |
| d.update(frame.f_globals) # Unless shadowed by global |
| d.update(frame.f_locals) |
| |
| message = "Signal received.\nTraceback:\n" |
| message += ''.join(traceback.format_stack(frame)) |
| logger.info(message) |
| |
| |
| @OsFamilyImpl(os_family=OsFamilyImpl.DEFAULT) |
| class HeartbeatStopHandlersLinux(HeartbeatStopHandlers): |
| def __init__(self): |
| self.heartbeat_wait_event = threading.Event() |
| self._stop = False |
| |
| def set_heartbeat(self): |
| self.heartbeat_wait_event.set() |
| |
| def reset_heartbeat(self): |
| self.heartbeat_wait_event.clear() |
| |
| def set_stop(self): |
| self._stop = True |
| |
| def wait(self, timeout1, timeout2=0): |
| if self._stop: |
| logger.info("Stop event received") |
| return 0 |
| |
| if self.heartbeat_wait_event.wait(timeout=timeout1): |
| return 1 |
| return -1 |
| |
| |
| |
| |
| def bind_signal_handlers(agentPid): |
| global _handler |
| if OSCheck.get_os_family() != OSConst.WINSRV_FAMILY: |
| if os.getpid() == agentPid: |
| signal.signal(signal.SIGINT, signal_handler) |
| signal.signal(signal.SIGTERM, signal_handler) |
| |
| bind_debug_signal_handlers() |
| |
| _handler = HeartbeatStopHandlersLinux() |
| else: |
| _handler = HeartbeatStopHandlersWindows() |
| return _handler |